[the crow]

I am sorry to say, the wind chill at 0F and 50mph is -31F according to NOAA:

http://www.nws.noaa.gov/om/windchill/

this source has it at -55F:

http://www.magnaownersoftexas.org/wind.htm

[Dog Gone]

I don't want to be a pessimist, but you can't survive in those conditions for a week. Unprotected, you won't survive an hour.

It's unrealistic to think the other two hikers were able to get more than a thousand feet away from the cave where the other hiker was found. Especially if they actually headed UP the mountain.

And if they were intent on getting to rescue instead of holing up themselves as it appears, they probably made their last mistake. Exhausted, cold, tired, and dehydrated, they probably eventually just laid down. It's what I would have done.

I'm hoping for rescue. That would be a very joyful surprise.